Cut steaks into 1 to 1 ½ inch pieces, season with salt and pepper.
Heat a cast iron skillet or pan over medium-high heat until hot. Add 2 tablespoons of vegetable oil, heat until shimmering and ready to sear meat.
Sear meat in batches, careful not to overcrowd the pan. Sear steak on all sides, turning several times during cooking. Remove steak from pan, set aside, continue with next batch adding additional oil as needed.
Reduce heat to medium, allow skillet time to lose some of the intense heat, 3-4 minutes. Add the butter, smashed garlic, thyme and rosemary, stirring until fragrant, for about 1 minute.
Add the steak back to the pan, stirring to coat with garlic herb butter and meld the flavors, 2-3 minutes.